Error when trying to obtain a certificate: The specified item could not be found in the keychain

Question

I was having a problem with codesigning my apps, so I deleted all the keys from the keychain. Then I went to Certificate Assistant => Request a certificate from a Certif

Answer 1

Even I was getting this issue. I solved this by selecting All Items instead of the Keys in the Categories pane and then trying to create the Certificate.

Try this, it will surely work.